The statements that you can only activate your original of windows xp on one of your computers, has proven to be false. I know for a fact, that when you call up Microsoft to activate, they just make sure that you have the CD code from the original, and they give you the activation code. Even if the CD code was already used for another PC. They have to do this, otherwise when someone swaps components enough on his PC and has to reactivate it, he wouldnt be able to. A Friend of mine has his Windows XP running on three pc's...all with the same CD code.
Just wanted to clear this up.
Windows XP isnt copy protected if you own the original. Its just a hassle. And you have that hassle when you build your own pcs, and trade parts regularly. After two years, I dont have any of the same components that were in the PC as I initially activated Windows XP. And I still get an activation code from microsoft everytime I have to re activate.